Blockchain Intermedio Interview Question-Answer

Blockchain Intermedio Interview Question-Answer

 Q.1 Blockchain is a distributed______.

 

       A. Server

 

       B. Ledger

 

       C. System

 

       D. Computer

 

Ans : Ledger

 

Q.2 _____ are a set of rules that verify and add transactions to a blockchain.

 

       A. Blocks

 

       B. Consensus mechanisms

 

       C. Mathematical formulas

 

       D. Laws

 

Ans : Consensus mechanisms

 

Q.3 What does C stands for in CAP theorem?

 

       A. Computation

 

       B. Capacity

 

       C. Correct

 

       D. Consistency

 

Ans : Consistency

 

Q.4 Bitcoin is a public, permisionless blockchain.

 

       A. True

 

       B. False

 

Ans : True

 

Q.5 Miners are rewarded with tokens like bitcoins and ether for mining the blocks.

 

       A. True

 

       B. False

 

Ans : True

 

Q.6 What is the total number of bitcoins that can ever exist?

 

       A. 21 millions

 

       B. 21 billions

 

       C. 1 millions

 

       D. 100 millions

 

Ans : 21 millions 


Q.7 Which type of blockchains are controlled by a particular person or organization?

 

       A. Private

 

       B. Public

 

       C. Personal

 

       D. Consortium

 

Ans : Private

 

Q.8 _____ is a process of verifying transactions, bundling them into blocks, and adding those blocks to the blockchain.

 

       A. Mining

 

       B. Digging

 

       C. Filtering

 

       D. Coding

 

Ans : Mining

 

Q.9 A peer to peer network of autonomous computers is a ______.

 

       A. Distributed System

 

       B. Client

 

       C. Server

 

       D. Super Computer

 

Ans : Distributed System

 

Q.10 _____ contains hash of previous block and all the important information required by the block.

 

       A. Block Header

 

       B. Block Metadata

 

       C. Chain

 

       D. Block Footer

 

Ans : Block Header

 

Q.11 Permissioned blockchains usually use PBFT algorithms.

 

       A. True

 

       B. False

 

Ans : True

 

Q.12 The Proof of Elapsed Time (PoET) concept was developed by ______ in early 2016.

 

       A. Intel

 

       B. Apple Computer

 

       C. Microsoft

 

       D. IBM

 

Ans : Intel

 

Q.13 _____ relies on exchange of messages among nodes that follow a distributed protocol to come to an agreement.

 

       A. Proof of Work

 

       B. Proof of Stake

 

       C. PBFT Algorithm

 

       D. Proof of identity

 

Ans : PBFT Algorithm

 

Q.14 Which release of Ethereum will have Proof of Stake Consensus algorithm.

 

       A. Juniper

 

       B. Serenity

 

       C. Constantinople

 

       D. Casper

 

Ans : Serenity

 

Q.15 Which consensus algorithm requires the users to have a stake in the blockchain?

 

       A. Proof of Work

 

       B. proof of stake

 

       C. proof of identity

 

       D. proof of elapsed time

 

Ans : proof of stake

 

Q.16 In private blockchains, you can create your own tokens for transactions.

 

       A. True

 

       B. False

 

Ans : True

 

Q.17 Consensus algorithms must be fault tolerant.

 

       A. True

 

       B. False

 

Ans : True

 

Q.18 Ether tokens can be used to buy Gas.

 

       A. True

 

       B. False

 

Ans : True

 

Q.19 A smart contract is a business logic or a legal agreement that is coded using a programming language.

 

       A. True

 

       B. False

 

Ans : True

 

Q.20 Oracles provide a trustless way of getting external information.

 

       A. True

 

       B. False

 

Ans : True

 

Q.21 ______ are systems that provide external data sources to smart contracts.

 

       A. True

 

       B. False

 

Ans : True

 

Q.22 ______ are systems that provide external data sources to smart contracts.

 

       A. Fortunes

 

       B. Tokens

 

       C. Routers

 

       D. Oracles

 

Ans : Oracles

 

Q.23 What are the main tokens used as digital currency in Ethereum?

 

       A. Bitcoin

 

       B. Gas

 

       C. Litecoin

 

       D. Ether

 

Ans : Ether

 

Q.24 Which type of cryptography uses only private keys?

 

       A. Symmetric

 

       B. Asymmetric

 

       C. Private

 

       D. Public

 

Ans : Symmetric

 

Q.25 _____ are the set of the rules and regulations that control the working of a blockchain.

 

       A. Laws

 

       B. Governance

 

       C. Protocols

 

       D. Consensus

 

Ans : Governance

 

Q.26 What are the two types of forks?

 

       A. Simple,Complicated

 

       B. Temporary, Permanent

 

       C. Alive, Dead

 

       D. Hard Fork, Soft Fork

 

Ans : Hard Fork, Soft Fork

 

Q.27 Which type of cryptography uses two cryptographic keys?

 

       A. Secure

 

       B. Private

 

       C. Dual Key Cryptography

 

       D. Asymmetric

 

Ans : Asymmetric

 

Q.28 Public blockchains are goverened by communities.

 

       A. True

 

       B. False

 

Ans : True

 

Q.29 A hash function should produce different output strings for the same input data.

 

       A. True

 

       B. False

 

Ans : False

 

Q.30 Ethereum is a programmable blockchain.

 

       A. True

 

       B. False

 

Ans : True

 

Q.31 _____ are a collection of key-value pairs, with state changes recorded as transactions on the ledger.

 

       A. Assets

 

       B. Transactions

 

       C. Tokens

 

       D. Blocks

 

Ans : Assets

 

Q.32 _____ is a javascript library that allows you to interact with Ethereum.

 

       A. Angular

 

       B. web3.js

 

       C. JQuery

 

       D. D3.js

 

Ans : web3.js

 

Q.33 You can have private test networks in Ethereum.

 

       A. True

 

       B. False

 

Ans : True

 

Q.34 Which of the following blockchain is used for non currency, industrial application?

 

       A. Hyperledger

 

       B. Ethereum

 

       C. Bitcoin

 

       D. Litecoin

 

Ans : Hyperledger

 

Q.35 What are the two types of accounts in ethereum?

 

       A. Public, Private

 

       B. Programmable, Non Programmable

 

       C. External, Contract

 

       D. Secure, Open

 

Ans : External, Contract

 

Q.36 ______ is a way of verifying the authenticity of digital messages and documents over the internet.

 

       A. Digital Imprint

 

       B. Password

 

       C. Digital Signature

 

       D. Fingerprint

 

Ans : Digital Signature

 

Q.37 What are the tokens used as computational fee in ethereum blockchain?

 

       A. Dollars

 

       B. Ether

 

       C. Gas

 

       D. Bitcoin

 

Ans : Gas

 

Q.38 Which release of Ethereum will have Proof of Stake Consensus algorithm.

 

       A. Juniper

 

       B. Serenity

 

       C. Constantinople

 

       D. Casper

 

Ans : Serenity

 

Q.39 What are the two main types of cryptography?

 

       A. Strict, Not strict

 

       B. Symmetric, Asymmetric

 

       C. Local, Global

 

       D. Private, Public

 

Ans : Symmetric, Asymmetric

 

Q.40 _____ is a software defining assets, and the transaction instructions modifying those assets

 

       A. Chaincode

 

       B. Transaction code

 

       C. Byte code

 

       D. Asset code

 

Ans : Chaincode

 

Q.41 Hyperledger platform was developed by ______.

 

       A. Linux Foundation

 

       B. Microsoft

 

       C. IBM

 

       D. IBM

 

Ans : Linux Foundation

 

Q.42 Which consensus algorithm requires a complex, computation intensive mathematical problem to be solved.

 

       A. PBFT

 

       B. PoS

 

       C. PoW

 

       D. PoI

 

Ans : PoW

 

Q.43 What are the two types of accounts in ethereum?

 

       A. Public, Private

 

       B. Programmable, Non Programmable

 

       C. Secure, Open

 

       D. External, Contract

 

Ans : External, Contract

 

Q.44 Which type of cryptography is also called public key cryptography?

 

       A. Asymmetric

 

       B. Symmetric

 

       C. Public

 

       D. Dual Key Cryptography

 

Ans : Asymmetric

 

Q.45 Ethereum is a public blockchain.

 

       A. True

 

       B. False

 

Ans : True

 

Q.46 Nodes are independent computing units of a distributed system.

 

       A. True

 

       B. False

 

Ans : True

 

Q.47 Hyperledger Fabric is a private blockchain.

 

       A. True

 

       B. False

 

Ans : True

 

Q.48 In ______ mechanism, the miner is selected based on reputation built over time.

 

       A. Stake based

 

       B. Elapsed Time

 

       C. Reputation based

 

       D. Power based

 

Ans : Reputation based

 

Q.49 What is the Consensus algorithm used by Ethereum?

 

       A. Dagger hashimoto

 

       B. Eth Consensus

 

       C. Ethash

 

       D. Ethereum Hash

 

Ans : Ethash

 

 Q.50 Which style of programming is well suited for Smart Contract programming?

A. Regular

B. Defensive

C. Modular

D. Functional

 

Ans : Defensive

 

Q.51 _____ is a mechanism that allows digital assets from one blockchain to be used as a separate blockchain.

A. Subchain

B. Sidechain

C. Forkchain

D. Bitcoin

 

Ans : sidechain

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